Hiro was facing one of his closes friends but this one is special to him. Cora that he met a few days ago or perhaps they've met few years ago because she was in that SFIT show of his microbots. It was unexpected to see or feel the pain. Then it start it to rain.

"Cora is th-hat you?"Hiro cries as he thinks it's an nightmare.

Cora have block her face with her bangs to not see her sorrow eyes"who's Cora"she lied.

Hiro walks up to her close"Look up and stare at me?"he demands.

"Give me my mask ?"Cora flinches and her face was shown.

"Cora why?"Hiro has a single tear on his face and tighten the mask.

"I said give me my mask Hiro?!"Cora yells.

Cora was about to cry but she shows no fear or mercy to her enemy"Cora why! I'm your Best friend! This can't be happening"Hiro throws the mask on the ground.

"Well it is! Hiro Hamada!"Cora tears drool on her rousing cheeks and immediately charges at Hiro while he's distracted.

Hiro was on the ground in pain"fight me Hamada!"Cora shouts"I know you wanna".

"I-I can't. I don't want to hurt you"Hiro struggles"you're my best friend".

"Oh so now you can't hurt me because I'm Cora instead of Sunpyre huh?!"Cora reaches out her broken mask.

"I've been tracking your family since I lost mine, my Master told me that you Hamada's are responsible of my family deaths and I'm gonna avenge them"Cora walks around Hiro.

"Cora what are you talking about? We've not hurt your family-".

"Lies! My master told me the truth that Hamada's can't be trusted, your Aunt she must've know what happen to my parents that's why I interrogated Alistair to know where you live but I guess I found out that we're best friends somehow"Cora continues" but I know because you've been in my memory since I don't know when!".

"Cora all I remember we're best friends since kindergarten but That doesn't add-"Hiro stops and though of something that the few days earlier he found a card.

"What does this means?"Hiro held up the card.

"It was a message from my master, I guess I was curious of the message too".

"Cora just stop of what you're doing its not right"Hiro gets up.

"Sorry Hiro"Cora glares"I have orders, and I don't disobey orders".

"Fight me Hamada?!"Cora shouted.

"I can't I won't hurt my bestie".

"If you can't then I will"Cora hisses.

[Hallway]

Gogo was walking through the hallways to find her fellow team mates. Something caught her attention, she stops to glance all of the graduation photos throughout this school years. Gogo then suddenly thinks of her high school years.

"Gogo!"Gogo turns and see Honey Lemon across the hallway.

"Honey Lemon are you okay?"Gogo walks to her.

"I'm well okay"HL glance around herself with the chemical slim.

"Let me help you out"Gogo pulls her out of the slim.

"Thanks Gogo, what happen?"HL wipe the slim off of her armour.

"Sunpyre attacked me, Hiro went to go after her at the football field alone"Gogo explains.

"What! With no backup!"HL said surprisedly. 

"Yeah I know stubborn boy"Gogo said sarcastically.

"Let's regroup with the boys so we could go to the football field to help your boyfriend"Honey Lemon walks off to the fourth floor.

"Okay, w-w-wait he's not my boyfriend!"Gogo retorted"in the future"she murmured to herself.

[Fred, Wasabi, and Baymax]

"Like seriously man, a banana peeled on the floor!"Wasabi complains.

"Dude just let it go, teenagers bro"Fred mumbles.

"Boys! What are you arguing about this time?"HL and Gogo shows up

"Girls, it seems that she got to you too huh?"said Wasabi while he ruffle his hair.

"You think"said Gogo as she cross her arms.

"Where's Hiro?"Wasabi ask.

"Football field fighting Sunpyre right now"Gogo replied.

"What! Alone, we must go"said Fred.

Everyone nodded and head it to downstairs to go outside at the football field.

[Football Field]

Cora gave her left fist and a side kick few times, Hiro couldn't handle her quick attack on him so he got kick off on to the ground.

"Have enough pain Hamada?"Cora mocks.

"You don't have to do this?!"Hiro shouts"besides, I could do this all day".

"Sorry lover boy!"Cora charges at Hiro to continue to attack him.

Hiro quickly evade on the right"Cora enough!".

"Oooh to bad"Cora in her girlish tone"I'm just having fun with my bestie"

Cora then body roll towards him to  punch his torso armour to damage it. Hiro quickly grasp her fists and slightly pushes her off and did a triple backflip.

"Impressive, but hopeless"said Cora as she grab a smoke grenade on her waist"I'm tired of playing around, I think my bots should play a visit to Auntie Cassie, I'm sure she knows what happen to my family!"Cora releases her smoke grenade, Hiro looks around him to be sure that she's not behind.

"Hiro are you okay?!"Gogo yells panickly as she runs to him along with the team.

Baymax shows up to air suck the whole smoke to make it clear for them to see"Hiro! Are you okay?!"Gogo runs to him, but she felt tempting to embrace him but the team is here with them.

"Hiro dude you alright?"said Fred.

"I'm fine, she escaped"Hiro glance down and grab his broken helmet.

"We don't stand a chance do we?"said Wasabi as he massages his neck.

"Hey dudes look what I found!"Fred shows them the Sunpyre's mask.

"Hiro you managed to take off her mask, so who's she is?"ask Honey Lemon curiously.

Hiro struggles to them who"I can't tell you, I think you should find out yourself"Hiro walks to Baymax.

"Baymax locate Sunpyre"Hiro applies.

"Sunpyre is moving quick to north side of town"Baymax responded.

"Ok, everyone I want you all to head back at HQ, rest at least for a few hours but be caution she knows where we all live"Hiro relevant.

"Hiro you're hiding something aren't you, please tell us who is Sunpyre?"Gogo scowls.

"Hiro c'mon tell us, we're a team we should all know"Honey Lemon exclaim.

Hiro looks at every one of them"fine you want to know, Baymax locate Cora"Hiro applies to him.

"Cora is moving quick to north side of town"Baymax points out.

The team was confuse that Sunpyre is heading to north side of town too until Gogo finally knows"no, it can't be true"she murmured.

"Cora is Sunpyre "Gogo speaks up.

Everyone was shock and confuse why she's doing this to them"w-wait your joking right?"said Wasabi.

Hiro nod his head as a no he's not joking"oh this is unexpected"Wasabi scratches his head.

"Guys head back to HQ, I'm going to the cafe"Hiro jogs to Baymax's back to beginning fly their destination.

Gogo then grasp Hiro's left leg"Hiro. Don't hurt her, she's our best friend, ask her why she's doing this, and who she's working for"Gogo explains to Hiro.

Hiro nodded at Gogo.

~~~~~~~~~~~~~~~~~~~~~~~~~~

[Lucky Cat Cafe]

As Hiro and Baymax went to go get Aunt Cass, the others went to Fred's to recover and rest to stay low for awhile for who knows when since their place is exposed.

While Hiro and Baymax landed safety at the back of Lucky Cat Cafe.

"Baymax stay outside just in case"Baymax blinks as a nod.

"Aunt Cass!"Hiro calls out as he opens the back door.

"Oh Hiro your home early, is somethings wron-"Aunt Cass looks at Hiro's armour.

"Hiro what is that on you?"she ask.

"I'll explain later but we need to go, now"Hiro took her hand to go outside.

"Hiro what's going on!"Aunt Cass demands.

"We uh, bad guys are coming over here"Hiro nervously said.

"Bad guys? Wait, your Big Hero 6 leader aren't you?"Aunt Cass glares at his nephew and Baymax outside.

"Ok fine I'am"Hiro chuckles nervously"but c'mon"he grabs Aunt Cass's hand to go at the back.

"Hiro you've got a lot of explaining to do young man!"Aunt Cass snapped.

"Hiro I'am detecting unfriendlies heading this way"said Baymax.

Hiro gulp"great they're here Aunt Cass you might wanna hold tight".

"I'am not flying"Aunt Cass retorts.

"Search the entire house"said a robotic voice.

"What are we waiting for, let's go"said Aunt Cass as she gets on.

"Halt!"said Robotic One, the robotic has human like legs, upper body is sliver with a core on the centre of their chest, their arms has similar gauntlets as Cora does. Their face has no mouth but a red light that lights up when they talk, and they have red glowing eyes.

"Baymax you know what to do!"Hiro yells.

Baymax blinks, he heated up his jet pack and fly away as possible. As they're trying to escape the robotics somehow has jet packs too.

"Oh gummy bears really?!"Hiro grumbles"Baymax lose them!".

"On it"Baymax boosts up his jet pack to lose the robotics.

"Power up packs!"said Robotic One to his companions.

Baymax went to the streets of San Fransokyo and tries to lose them by the skyscrapers or the mid tall buildings. The Robotics shoots one of their nets to capture them alive.

"Oh cheese cakes!"Aunt Cass screams.

"Baymax!"Hiro yells.

"I'am trying".

Hiro thinks for a moment"Baymax head to the subway tunnels!".

Baymax lower to the open tunnel hole but still they've follow them.

Hiro looks at the central of all subway train routes"Baymax go that way!"he points out.

They've went there and they're a few subway trains passing by them which makes the Robotics confuse to trace them detected.

"We lost them"said Robotic Two.

Robotic One growls.

Baymax, Hiro and Aunt Cass exit at the south side of San Fransokyo subway tunnel and finally at the sky.

"We lost them, good"Hiro then led Baymax land on the roof of an building.

"Hiro you've got a lot of explain to do young man!"Aunt Cass retorts.

"Aunt Cass I know this stuff is weird and all even though I'm BH6 leader but I'am".

"Well it is and ugh!"Aunt Cass reaches out an cookie on her purse"stress eating! Again!"she walks back and forth.

Hiro chuckles"umm Aunt Cass I got a question".

Aunt Cass finishes her cookie"ok what's the question?".

"Sunpyre, you know the thief that stoled the experimental serums from those laboratory facilities. It's hard to say that I found out who she is"Hiro had sorrow eyes.

"I'm listening"Aunt Cass comes closer.

"Sunpyre is.....Cora"Hiro sadly said.

Aunt Cass covers her mouth in shock"well, that's unexpected".

Hiro looks at Aunt Cass"she mentions that she lost her family because of us Hamadas, I don't understand what she meant by that"Hiro turns around face at the sky.

Aunt Cass then glance at her purse"I think I know what she meant".

Hiro turns around"really, what?".

"Baymax can you fly us to McKay mountains"Aunt Cass asks.

"Certainly Miss Cass".

~~~~~~~~~~~~~~~~~~~~~~~~~~

[Ruins of Hamada residents]

As they landed safely on the mountains they saw an old poor pert that has been abandoned.

"Aunt Cass why we're here?"Hiro ask curiously as he stares around the area.

Aunt Cass gets off of Baymax's back"follow me"she said in almost sad tone.

"Baymax stand guard if someone comes by"said Hiro as he follows Aunt Cass.

"Okay"Baymax replied.

Hiro and Aunt Cass walk to the old burned gate"Aunt Cass what is this place?".

Aunt Cass pushes the door and reveal an old burned home of someone else's.

"Whoa"Hiro gasp.

Hiro then shakes his head and stay focus"Aunt Cass you've brought me here for a reason and I gotta know".

Aunt Cass reaches out a little box from her purse"open it"she said.

Hiro opens the little box and reveal a Yang piece necklace"w-what a Yang necklace".

"Yes".

Hiro held the necklace and realize Cora has one too but the Yin piece.

"I don't understand"Hiro looks up at Aunt Cass"Cora has the Yin-"Hiro shakes his head and thinking of that he's not sure if it's true.

"You.....had head conclusion when you were 4, I know I told you that your parents died when you were 3 but I lied. I'm hiding a truth that I should've told you while your brother was around to support you"Aunt Cass explains.

"W-w-what are you saying?"Hiro stutters.

"Hiro. Cora is your long lost twin sister".

Hiro expression turns to disbelief.